Land Rover Communications Network Unknown Manual
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GENERAL Communication Network (Media Oriented System Transport MOST )Sheet 1 of 3 NOTE: D= HS CAN Bus P= MOST Communications NetworkLesson 2 – Electrical 193Technical Training (G421292)
Instrument cluster1 Harman Kardom Logic 7 amplifier2 Rear seat entertainment module3 DVD autochanger4 Harman Kardon amplifier5 Transceiver module6 (G421292) Technical Training194 Lesson 2 – ElectricalCommunications Network
Traffic Message Channel (TMC)7 Touch Screen Display (TSD)8 Television tuner module9 Integrated Head Unit (IHU)10 Communications NetworkLesson 2 – Electrical 195Technical Training (G421292)
Communication Network (CAN bus) Sheet 2 of 3 NOTE: D= HS CAN Bus N= MS CAN Bus O= LIN Bus Steering angle sensor1Instrument cluster2 (G421292) Technical Training196 Lesson 2 – ElectricalCommunications Network
Diagnostic socket3 Integrated Head Unit (IHU) or Head unit4 Heating and ventilation control module5 Fuel burning heater6 Seat occupancy sensor (NAS only)7 Restraints control module8 Terrain Response
Communication Network (CAN bus) Sheet 3 of 3 NOTE: D= HS CAN Bus N= MS CAN Bus O= LIN Bus Engine Control Module1Tyre pressure monitoring control module2 (G421292) Technical Training198 Lesson 2 – ElectricalCommunications Network
Park Distance Control (PDC) module3 Central Junction Box (CJB)4 Rain senor5 Memory control module6 Sunroof control module7 Battery backed up sounder (BBuS)8 ABS control module9 Automatic Front Lighting System (AFS)10 Transfer box control module11 Transmission control module12 A number of different types of data bus are incorporated into the vehicle wiring harnesses for the transmission of commands and information between ECU’s. The bus configuration installed on a particular vehicle depends on the model and equipment level. The available types of bus systems on the vehicle are: •High speed Controller Area Network (CAN) bus •Medium speed CAN bus •Media Orientated System Transport (MOST) bus •Gigabit Video Interface (GVIF) •Local Interconnect (LIN) bus •Security Local Interconnect (SLIN) bus ProtocolBaud rateBus 11898500 kbits/sHigh speed CAN 11898125 kbits/sMedium speed CAN MOST Cooperation24 MbsMOST Sony proprietary system1.95 GbpsGVIF LIN consortium9.6KbsLIN Controller Area Network (CAN) The CAN bus is a high speed broadcast network where the ECU’s automatically transmit information on the bus every few microseconds. The other buses are low speed networks which are mainly event driven, i.e. an electronic control module outputs a message only in response to a request message from another ECU or a hard wired input from a switch or sensor. A twisted pair of wires are used for the CAN bus and single wires are used for all of the other buses. Bus wires can be repaired using crimped connections. The unwound length of CAN bus wires must not exceed 40 mm (1.6 in). Two CAN busses are employed on the vehicle: •Medium speed •High speed The medium speed bus connects the following control modules: •Integrated Head Unit (IHU) or low line head unit •Heating and ventilation control module •Fuel burning heater •Park distance control •Tyre pressure monitoring control module •Central junction box The high speed bus connects the following control modules: Communications NetworkLesson 2 – Electrical 199Technical Training (G421292)
•Steering angle sensor •Air suspension •Electric park brake •Electronic rear differential control module •Terrain Response
CJB also acts as a bi-directional gateway between the MS-CAN bus and the LIN bus by passing signals between the two buses. The bus is a single wire and operates at 9.6Kbs. The protocol used on the LIN bus is defined by the LIN consortium. Diagnostic Socket The diagnostic socket allows the transfer of information between the vehicle Electronic Control Modules and T4 on the high or medium speed CAN bus, or indirectly via the instrument pack. The diagnostic socket is located in the lower instrument panel closing panel, on the drivers side below the steering column. Communications NetworkLesson 2 – Electrical 201Technical Training (G421292)